suiyou yori nitiyou no hou ga kazoku to yukkuri hanaseru.

This is the very common comparison pattern:

A より B のほうが + predicate

It means B is more ... than A.

So here:

• 水曜より = than Wednesday
• 日曜のほうが = Sunday more / the Sunday side
• 家族とゆっくり話せる = the thing being compared

So the sentence is comparing Wednesday and Sunday, and saying that Sunday is the day on which the speaker can talk with family more leisurely.

Because ほう is a noun meaning side, direction, or option.

So 日曜のほう literally means the Sunday side or the Sunday option.

In Japanese, when one noun modifies another noun, you often connect them with の:

• 日曜 + の + ほう
• Sunday + side

This is just how the comparison expression is built.

Because ほう needs something to tell you which side you mean.

Compare:

• 日曜のほう = the Sunday side
• こちらのほう = this side
• 安いほう = the cheaper one (here an adjective modifies ほう instead)

With nouns like 日曜, 水曜, 日本, 犬, etc., you normally use の before ほう.

In this comparison pattern, が usually marks the item being judged as more of something.

So in:

水曜より日曜のほうが家族とゆっくり話せる

the part 日曜のほうが marks Sunday as the side that better fits the statement can talk leisurely with family.

This AよりBのほうが... pattern is extremely standard.

You may sometimes see は in other contrastive sentences, but が is the normal choice here.

話せる is the potential form of 話す.

• 話す = to talk / to speak
• 話せる = can talk / be able to talk

So this is not just talks. It means there is an ability, chance, or opportunity to talk.

In this sentence, it probably means something like:

• Sunday gives me more time
• Sunday makes it easier
• Sunday is a better situation for talking with family

So 話せる is not just about physical ability; it often includes whether circumstances allow it.

Not exactly in the literal slow speaking speed sense.

Here ゆっくり話せる usually means:

• talk in a relaxed way
• talk without rushing
• have time to really talk
• talk at leisure

So the idea is probably not I speak more slowly on Sunday, but rather I have more time to sit down and talk calmly on Sunday.

Because と話す usually means to talk with someone, as in a mutual conversation.

• 家族と話す = talk with family
• 家族に話す = talk to family / tell family

So:

• と suggests a two-way conversation
• に can sound more one-way

In this sentence, 家族と is natural because the idea is having a conversation with family.

They are shortened forms:

• 水曜 = 水曜日
• 日曜 = 日曜日

These shorter forms are very common, especially in everyday speech and casual writing.

So the sentence sounds natural and normal. Using 水曜日 and 日曜日 would also be correct, but a little fuller.

Because Japanese often leaves out the subject when it is already understood from context.

So even though English usually needs something like I or we, Japanese often does not say it.

Depending on context, this sentence could mean:

• I can talk more leisurely with my family on Sunday
• we can talk more leisurely with our family on Sunday
• he/she can talk more leisurely with family on Sunday

In real use, the listener is expected to figure that out from the situation.

It is in the plain/casual style because it ends with 話せる.

A polite version would be:

水曜より日曜のほうが家族とゆっくり話せます。

Both mean the same basic thing, but:

• 話せる = plain
• 話せます = polite

The sentence is comparing Wednesday and Sunday in terms of how easily the speaker can talk with family in a relaxed way.

Japanese does not explicitly say whether that means:

• for a longer time
• more comfortably
• more often
• with less stress
• with more opportunity

It just leaves that broad idea inside ゆっくり話せる.

So the comparison is not only about raw ability; it is about the overall situation being better on Sunday for relaxed family conversation.